Also, probably one of the simplest...
That's why I decided to write an interpreter for it!
This is the product of about 3 days of work, give or take, but the sessions were long and I put a lot into it.
If you're a Haskeller reading this, please feel free to critique it (I'm sure it could be improved in many places)!
If you're not, please feel free to check it out anyway! I encourage everyone to play around with brainfuck a little bit because it's actually a lot of fun.
If you're not familiar with the language, a quick look through brainfuck's Wikipedia page should help you to understand what's going on in brainfuck (it's not too complex).
With the interpreter, you can write a file, say thisisbf.b, containing the classic "Hello, world!" brainfuck program directly from the wikipedia page:
and pass it to the interpreter:
$ build\windows\fhck.exe thisisbrainfuck.bor Linux (or presumably Mac OSX, though I haven't tried):
$ build/linux/fhck thisisbrainfuck.b...and it should print "Hello, world!" to your console!
Neat, right? (I think so!)
Download link/source is located here: fhck 1.0